Dandy-roll for paper-machines



(No Model.)

D. MoKAY.

DANDY ROLL FOR PAPER MACHINES. No. 252,050. Patented Jan. 10,1882;

UNITED STATES PATENT OFFICE.

DAVID MGKAY, OF HOLYOKE, MASSACHUSETTS.

DANDY-ROLL FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 252,050, dated January 10, 1882, Application filed September 10, 1881. (No model.)

froth and other accum ulalions.

Figure 1 is an ordinary dandy-roll. Fig. 2 is a long section view of a dandy-roll with the catch-pan A attached. Fig. '3 is a transverse section of dandy-roll without the catch-pan.

Fig. 4 is a transverse section of dandy-roll with catch-pan B attached. Fig. 5 is a view, in perspective, of the catch-pan.

The dandy roll, the purpose of which is to make both surfaces of the paper alike,is a hollow cylinder of woven wire. As the roll revolves upon the wet paper, particles of the paper-pulp are forced through the wire net-work of the roll until, accumulating in masses inside of the roll, they are again forced out through the wire net-Work'upon the paper, blotching and marring its surface. Heretofore the manner in which these accumulations have been removed was to take the dandyroll out of position, causing a stoppage of the machine and a consequentloss of production.

The catch-pan, as seen in Fig. 2, hangs upon the center shaft of the dandy-roll, and is held by its own weight in an upright position while the roll revolves, catching the (lrippings from the top of the inside of the roll, and also catching upon the edge of the pan, which may be made of sheet-tin or other material of like thinness, the particles of pulp or other matter forced through the net-Work surface of the roll. Through-the opening 13, Figs. 4 and 5, in one end 0f the catch-pan, the contents of thcpan will be constantly carried ofl" at the end of the dandy-roll. If the accumulations in'the pan are such as will not run oft freely through the opening B, Fig. 4, a stream of water is to be poured into the pan at the opposite end, or

otherwise.

I claim as my invention The catch-pan A, Fig. 5, to be hung in the inside of and upon the center shaft of the dandy-roll in paper-machines, to he kept in position by its own weight, for the purpose of cleaning dandy-rolls, substantially as set forth in the above specification.

DAVID MGKAY.

Witnesses:

EDWARD MOKAY, JOHN J. REARDON. 

